1995

A vial of Sleeping Draught

The four dragons used in the first task of the Triwizard Tournament in 1994 were given Sleeping Draught to make the trip from the Romanian Dragon Sanctuary to Hogwarts easier. Charlie Weasley stated that he thought it would be better for the dragons to awake in a tranquil setting, but, upon waking in the Forbidden Forest, the beasts were as vicious as ever. In Charlie's words, the team of dragonologists used "a Sleeping Draught" to knock out all four dragons, suggesting that a normal dose of the potion might be potent enough to have an effect on a creature as big as a dragon.

2020

On 31 August, Ginny Weasley asked Harry Potter if he wanted to take a Sleeping Draught in order to help him get back to sleep.[5]

Unknown

"Alright, I've made enough of this Sleeping Draught to knock out ten men… or one troll. Not bad, considering you foraged half the ingredients. A for Acceptable. I've already added the potion into the tea urn, so it should be lights out for our Muggles."